JP3300079B2 - Water supply system and exhaust heat recovery boiler for combined cycle plant - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply system and a waste heat recovery boiler for a combined cycle plant, and reduces equipment costs by eliminating a medium pressure water supply pump.
And a water supply system of a combined cycle plant suitable for improving the pump efficiency of the high-pressure water supply pump; and
It relates to an exhaust heat recovery boiler , and is particularly applied to a power plant.

[0002]

2. Description of the Related Art First, a conventional power plant is shown in FIG.
This will be described with reference to FIG . FIG. 2 is a system diagram showing a conventional gas turbine power plant generally used. The gas turbine power plant shown in FIG. 2 includes an air compressor 1, a combustor 2, a gas turbine 3, and a generator 4. The power plant compresses the air sucked by the air compressor 1 and guides the compressed air to the combustor 2, in which the fuel is burned in the compressed air to generate a high-pressure high-temperature gas. 3 is a cycle in which mechanical energy is obtained by expanding the gas turbine 3 in the gas turbine 3, and an open cycle in which exhaust gas is released to the atmosphere is often used.

In such a cycle, the gas turbine 3
Since the temperature of the exhaust gas discharged from the furnace is high, the exhaust gas loss is extremely large, and the net thermal efficiency is about 20 to 26%. Therefore, if this exhaust gas is used effectively,
Thermal efficiency is greatly improved. Gas turbine power generation has the advantages of low construction costs and quick start and stop.

[0004] FIG. 3 is a system diagram showing a steam turbine power plant that has been widely used in the past. FIG.
The steam turbine power plant shown in FIG.
, Steam turbine 14, generator 15, condenser 16
, Condensate pump 17 and feed water heater 1 installed in two stages
8, 19, a water supply pump 20, a economizer 22 and an air preheater 23 installed in a flue 21,
And a cooling water pump 25 provided in the condenser 16. The steam generator 10 includes a combustion device 11, a boiler 12, and a superheater 13.

[0005] In this steam turbine power plant, fuel and air are fed into the combustion device 11 of the steam generator 10. As the fuel, coal, heavy oil or gas is used. The air is preheated by an air preheater 23 installed in the flue 21 and supplied to the combustion device 11. Feed water discharged from a feed water pump 20 is fed into the boiler 12 after its temperature is raised by a economizer 22 installed in a flue 21. The feedwater fed into the boiler 12 receives the heat of combustion by the combustion device 11, evaporates, is further heated by a superheater 13, and is sent to a steam turbine 14 as superheated steam. Next, the superheated steam expands in the steam turbine 14 to rotate the generator 15 and generate electricity to perform work.

[0006] The steam that has lost heat energy by performing the work as described above is discharged to the condenser 16. This condenser 1
At 6, the steam is cooled by the cooling water sent from the cooling water pump 25 and is restored to water. The condensate is taken out of the condenser 16 by the condensate pump 17, and the condensate is extracted from the steam turbine 14 by feed air heaters 18 and 19.
, And the water is again supplied to the boiler 12 by the water supply pump 20.

FIG . 4 is a system diagram of a combined cycle plant currently considered . The combined cycle plant shown in FIG. 4 includes a gas turbine open cycle unit, an exhaust heat recovery boiler 34, a steam turbine cycle unit, and a power generator 59. In recent years, gas turbines have become higher in temperature and higher in efficiency, and the exhaust gas temperature of turbines has become higher. Such a device is, for example, the Ebara Time Signal No. 132 "High pressure feed pump for combined cycle plant", page 28-
32, October 1985.

The gas turbine cycle section has an air compressor 31, a combustor 32, and a gas turbine 33. Further, the exhaust heat recovery boiler 34 includes a low pressure economizer 3.
5, low pressure steam drum 36, low pressure evaporator 37, medium pressure economizer 77, medium pressure steam drum 78, medium pressure evaporator 79
, Two-stage high-pressure economizers 38 and 86, and a high-pressure steam drum 3
9, a denitration device 41, a high-pressure evaporator 42, and a superheater (high
Pressure superheater) 43 and a water supply system including a high-pressure water supply pump 54. The exhaust heat recovery boiler 34 is provided with a chimney 60 following the flue.

The steam turbine cycle section includes a steam turbine 46 powered by steam generated by the heat recovery steam generator 34 and a condenser 47. The low pressure steam drum 36 of the exhaust heat recovery boiler 34 is connected to the low pressure stage side of the steam turbine 46 via a steam pipe 44, and the exhaust heat recovery boiler 34 is connected to the high pressure stage side via a steam pipe 45. Superheater 43 is connected. The condenser 47 shown in FIG. 4 is of an axial flow type and is provided with a deaerator inside, so that the deaerator is not separately installed.

The condenser 47 and the heat recovery steam generator 34 are connected by a water supply system. The water supply system includes a water supply pipe 48 connecting the condenser 47 and the low-pressure economizer 35 of the heat recovery steam generator 34, and a water supply pipe 51 connecting the low-pressure economizer 35 and the low-pressure steam drum 36. , This water supply pipe 51
A water supply pipe 53 branched from the medium pressure saver 77 and the high pressure saver 38; a water supply pipe 81 connecting the medium pressure saver 77 and the medium pressure steam drum 78; Charcoal 3
Water supply pipes 57 and 87 connecting the high pressure steam drum 39 and the high pressure steam drum 39 are provided.

A water supply pipe 48 connecting the condenser 47 and the low-pressure economizer 35 has a low-pressure water supply pump (condenser pump ).
P) 49 are provided. A water supply pipe 51 connecting the low-pressure economizer 35 and the low-pressure steam drum 36 is provided with a water supply regulating valve (not shown). The water supply pipe 5
Water supply pipe 8 provided between 1 and medium pressure economizer 77
8 is provided with a medium-pressure water supply pump 80. further,
A high-pressure water pump 54 is provided in a water supply pipe 90 provided between the water supply pipe 51 and the high-pressure economizer 38. In addition, the medium pressure economizer 77 and the medium pressure steam drum 7
A water supply adjustment valve (not shown) is provided in a water supply pipe 81 connecting the water supply pipe 8 to the water supply pipe 8. Further, the high pressure economizer 86
A water supply adjustment valve (not shown) is provided on a water supply pipe 87 connecting the high pressure steam drum 39 with the water supply pipe 87.

By the way, in the combined cycle plant shown in FIG.
The generator 59 is rotated to generate power by the same operation as the gas turbine power plant shown in FIG. In addition,
The air compressor 31 is variable so that an inlet guide vane (not shown) can control the air flow rate, and can increase the temperature of the gas turbine exhaust gas at the time of partial load. Then, the low pressure low temperature gas is discharged from the gas turbine 33 as exhaust gas.

In the exhaust heat recovery boiler 34, the water supply pipe 4
After heating the feed water supplied to the low-pressure economizer 35 from 8 using the residual heat of the exhaust gas, the feed water is sent to the low-pressure steam drum 36 through the feed water pipe 51, and is fed into the low-pressure evaporator 37 from the low-pressure steam drum 36 to remove the exhaust gas. The steam is generated by further heating using the residual heat, and the steam is returned to the low-pressure steam drum 36. From the low-pressure steam drum 36, the saturated steam is sent to the steam turbine 46 through the steam pipe 44 through the low-pressure superheater 82, The steam turbine 46 is rotated.

On the other hand, a part of the water supplied from the low-pressure economizer 35 is sent to the medium-pressure economizer 77 through the water supply pipe 53 and the intermediate-pressure water supply pump 80. And this medium pressure economizer 7
After heating using the residual heat of the exhaust gas in 7, the water supply pipe 8
1, the steam is sent to a medium-pressure steam drum 78, and from the medium-pressure steam drum 78 to a medium-pressure evaporator 79, steam is further generated by utilizing the residual heat of the exhaust gas, and the steam is once returned to the medium-pressure steam drum 78. Then, the steam is sent from the medium-pressure steam drum 78 to the medium-pressure superheater 83 to be superheated. The superheated steam is sent from the superheater 83 to the steam turbine 46 through the water supply pipe 85 via the reheater 84, 4
Rotate 6.

Further, a part of the water supplied from the low pressure economizer 35 is sent to the high pressure economizer 38 through the water supply pipe 90 and the high pressure water pump 54. And this high pressure economizer 3
After heating using the residual heat of the exhaust gas in 8, the water supply pipe 5
7, through the next high-pressure economizer 86, feed water pipe 87
To the high-pressure steam drum 39, and from the high-pressure steam drum 39 to the high-pressure evaporator 42, where the waste gas is further heated by using the residual heat of the exhaust gas.
From the high-pressure steam drum 39 to the superheater 43 to be superheated. The superheated steam is sent from the superheater 43 to the steam turbine 46 through the steam pipe 45 to rotate the steam turbine 46.

Accordingly, the steam turbine 46 receives the saturated steam sent from the low-pressure heater 82, the high-temperature reheat steam sent from the reheater 84 via the steam pipe 85, and the steam sent from the superheater 43. It is rotated and driven by the incoming superheated steam, and the generator 59 is rotated to generate electricity. Further, nitrogen oxides contained in the exhaust gas supplied to the exhaust heat recovery boiler 34 are collected by the denitration device 41 installed in the optimum gas temperature section, where the nitrogen oxides are removed and the work is performed. The exhaust gas is discharged from the chimney 60 to the atmosphere.

[0017] Such a combined cycle plant is a power plant in which two power generation systems are combined to obtain high thermal efficiency.
It is operated as. The generator of the combined cycle plant has a multi-shaft type in which the gas turbine cycle unit and the steam turbine cycle unit have separate generators, and a gas turbine cycle unit and a steam turbine cycle unit. And a single-shaft type having a common generator, FIG. 4 shows an example of a single-shaft type.

[0018]

As described above, FIG.
The water supply system of the combined cycle plant shown is a water supply pipe 48 connecting the condenser 47 and the low-pressure economizer 35.
And a low-pressure water supply pump 49 provided therein, and a water supply pipe 51 connecting the low-pressure evaporator 35 and the low-pressure steam drum 36.
A water supply regulating valve (not shown) provided therein, a water supply pipe 88 branched from the water supply pipe 51 and connected to a medium pressure economizer 77, and a medium pressure water supply pump 80 provided therein.
, A water supply pipe 81 connecting the medium-pressure economizer 77 and the medium-pressure steam drum 78, a water-supply adjusting valve (not shown) provided therein, and a high-pressure economizer branched from the water-supply pipe 53. 3
8, a high-pressure water pump 54 provided therein, and two-stage high-pressure economizers 38, 86 and high-pressure steam drums 39, and water supply pipes 57, 87. And a provided water supply regulating valve (not shown).

However, the combined cycle plan
(1) To supply water to the high-pressure steam drum 39, the medium-pressure steam drum 78, and the low-pressure steam drum 36, the number of pumps satisfying the respective specifications must be installed. (2) The high-pressure water pump 54 The specifications (flow rate, total head, rotation speed, etc.) should be expanded to be standard pump specifications. (3) Regarding the performance of the high-pressure water supply pump 54, the efficiency should be increased and the operating characteristics should be stabilized. (4) ) There has not been sufficient consideration for improving economic efficiency and reliability, such as lowering the suction pressure of the intermediate-pressure water supply pump 80 and using the medium-pressure water supply pump 80 as a standard pump.

An object of the present invention is to eliminate the medium pressure feed pump,
By supplementing the load of the medium-pressure water pump with the high-pressure water pump, the design specifications of the high-pressure water pump can be made standard specifications and the water supply system and exhaust heat recovery system of the combined cycle plant.
To provide a collecting boiler . In addition, other eye of the present invention
It is an object of the present invention to provide a water supply system device and a waste heat recovery boiler for a combined cycle plant that can increase the efficiency of a high-pressure water pump and stabilize operation characteristics.

[0021]

In order to achieve the above object , a water supply system of a combined cycle plant according to the present invention is configured such that condensate taken out from a condenser is passed through a low-pressure economizer. A piping system that supplies water to the low-pressure steam drum, passes through the low-pressure economizer, then supplies water to the medium-pressure steam drum via the medium-pressure economizer, and a piping system that supplies water to the high-pressure steam drum via the high-pressure economizer. In a water supply system of a combined cycle plant having high, medium, and low pressure steam drums provided with: a water supply pipe directly connecting the low pressure economizer and the high pressure economizer; a high pressure water pump provided in the water supply pipe; The high-pressure water supply pump supplies water to the high-pressure steam drum via the high-pressure water-saving device, and also provides water supply piping for extracting water from an intermediate stage of the high-pressure water supply pump and supplying the extracted water to the medium-pressure energy-saving device.

In order to achieve the above object , the structure of the water supply system of the combined cycle plant according to the present invention is characterized in that, in addition to the structure of the above invention , water extracted from the intermediate stage of the high pressure water pump is supplied to a medium pressure steam drum. And a pipe for further branching the water extraction pipe of the high-pressure water pump and returning to the low-pressure economizer.

Furthermore, in order to achieve the above object,
The configuration of the exhaust heat recovery boiler according to the present invention is based on a condensate pump.
The condensate taken out of the condenser is reduced in pressure through a economizer.
Medium pressure via piping system to supply to steam drum and economizer
High-pressure steam through the piping system that supplies the steam drum and the economizer
High, medium and low pressure steam pumps with a piping system for supplying water to the drum
Water supply system of combined cycle plant with ram
Installed in a piping system for supplying water to the high-pressure steam drum.
The high-pressure economizer is the
Medium-pressure economizer as an economizer installed in the piping system that supplies water
And a pipe connecting the condenser and the high-pressure steam drum
A high-pressure water pump is installed in the system, and
While supplying water to the high-pressure steam drum through the high-pressure economizer,
Water is extracted from the intermediate stage of the high-pressure water supply pump, and
Water is supplied to the medium pressure economizer.

Further, in order to achieve the above object,
Configuration of the exhaust heat recovery boiler according to the present invention, condensate from condenser
The condensate taken out by the pump is supplied to the water supply piping and economizer.
Via a high-pressure steam drum, connected to a high-pressure evaporator
Medium-pressure steam drum connected to medium-pressure evaporator, low-pressure evaporator
Water supply to each connected low pressure steam drum
In the configured waste heat recovery boiler, a high
A pressure feed pump, and the high pressure feed pump
A water supply system for supplying water to the steam drum;
Water is extracted from the intermediate stage, and the extracted water is supplied to the medium-pressure steam drum.
A water supply system for supplying water, and the high-pressure steam drum and
And superheat the steam from the medium pressure steam drum, respectively.
It has a high-pressure superheater and a medium-pressure superheater.
Furthermore, in order to achieve the above object, the present invention
The configuration of the exhaust heat recovery boiler is high in addition to the configuration of the above invention.
A pressure saver and a medium pressure saver, wherein the high pressure steam drum
The water supply system for supplying water to the
The condensate is supplied via the economizer and is supplied to the medium-pressure steam drum.
The water supply system for supplying water is supplied from the middle stage of the high-pressure water supply pump.
The condensate is supplied through the medium pressure economizer
is there.

[0025]

The function of the above technical means is as follows. A low-pressure economizer and a high-pressure economizer are directly connected by a water supply pipe, a high-pressure water supply pump is provided in this water supply pipe, and the high-pressure steam drum is supplied with water through the high-pressure economizer by the high-pressure water supply pump. Water is extracted from the middle stage of the high-pressure water supply pump to the charcoal, and the water is supplied through a water supply pipe. Therefore, the water supply pump can be shared as compared with a conventional water supply system. As a result, the design pressure and the feedwater flow rate of the high-pressure water pump can be increased, and the specifications of the standard pump can be increased, so that the selection range of the high-pressure water pump can be expanded.

Although the pump performance characteristics have many factors that cause instability on the low flow rate side, in the present invention, water supply to the medium pressure steam drum is added as a flow load of the high pressure water supply pump. It is possible to stabilize the operating characteristics of the high-pressure feed pump, thereby reducing the operating power, preventing a reduction in life due to erosion, and improving the economics and reliability of the operation of the high-pressure feed pump. .

[0027]

An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a system diagram of a combined cycle plant according to one embodiment of the present invention. In the figure, components having the same reference numerals as those in FIG. 4 are the same as those in the above-described prior art, and the description thereof will be omitted. In FIG. 1, reference numeral 54 denotes a high-pressure water supply pump, 54a denotes a water extraction pipe serving as a water extraction port for extracting water from an intermediate stage of the high-pressure water supply pump, and 90 denotes a high-pressure water supply pump 54.
88 is a water supply pipe connecting the high pressure water supply pump 54 with the water extraction port of the high pressure water supply pump 77, and 92 is a water supply pipe connecting the high pressure water supply pump 54 with the water extraction pipe of the high pressure water supply pump 54. This is a feedwater bypass pipe connecting the low pressure economizer 35.

In the water supply system of the embodiment shown in FIG. 1, the low-pressure economizer 35 and the high-pressure economizer 38 of the exhaust heat recovery boiler 34
Water supply pipes 51 and 53, high-pressure water supply pump 54, water supply pipe 9
Directly connected by 0. The middle stage of the high-pressure water supply pump 54 and the medium-pressure economizer 77 are connected to a water extraction pipe 54a and a water supply pipe 9.
They are tied by one. In addition to the water supply pipe 91, a water supply bypass 92 branched from the water extraction pipe 54a and reaching the low-pressure economizer 35 is provided.
2 is supplied with water to prevent corrosion of the outer surface of the low pressure economizer tube.

The other components of the combined cycle plant shown in FIG. 1 and the water supply system are the same as those of the prior art shown in FIG. As described above, the suction port of the high-pressure water supply pump 54 is connected to the outlet side of the low-pressure economizer 35 through the water supply pipes 53 and 51, and the extraction pipe 54 a of the high-pressure water pump 54 is connected to the medium-pressure economizer through the water supply pipe 91. The outlet of the high-pressure water supply pump 54 is connected to the inlet side of the high-pressure economizer 38 through a water supply pipe 90.

The water supply system of this embodiment using the high-pressure water supply pump 54 and having a water supply pipe attached thereto is used and operates as follows. That is, the low-pressure steam drum 36,
Water supplied to the medium-pressure steam drum 78 and the high-pressure steam drum 39 is supplied from the condenser 47 shown in FIG.
(Condensation pump) The condensed water is taken out by 49 and the condensed water is supplied through the water supply pipe 48 to the low-pressure water supply pump 4.
It is sent to the low pressure economizer 35 by 9.

In the low-pressure economizer 35, the feed water is heated by using the residual heat of the exhaust gas, and then the feed water pipes 51, 53 are heated.
To the high-pressure water pump 54. Then, a part of the water supply is taken out from a water extraction port provided at a position corresponding to the intermediate stage impeller in the pump casing of the high-pressure water supply pump 54, and the extracted water is used as water supply, and the water extraction pipe 54a,
The water is sent to the medium-pressure economizer 77 via the water supply pipe 91. Furthermore, take out part of the water supply from the water extraction port, and use the water extraction as water supply,
The water is sent to the low-pressure economizer 35 via the water extraction pipe 54a and the water supply pipe 92. On the other hand, another part of the water supply is discharged from the discharge port of the high-pressure water supply pump 54, and the water supply is sent to the high-pressure economizer 38 through the water supply pipe 90.

In the high-pressure economizers 38 and 86, as in the conventional water supply system, the feed water is heated by using the residual heat of the exhaust gas, and then the high-pressure water is supplied through the feed water pipes 57 and 87 and a feed water regulating valve (not shown). Send to steam drum 39. The water supplied to the low-pressure steam drum 36, the medium-pressure steam drum 78
The water supplied to the steam turbine 46 and the water supplied to the high-pressure steam drum 39 are supplied to the steam turbine 46 through the same process as in the conventional combined cycle plant shown in FIG.

In the embodiment shown in FIG. 1, the flow rate of the high-pressure water supply pump 54 is increased by the amount of water supplied to the medium-pressure economizer 77 as compared with the high-pressure water supply pump of the conventional water supply system. On the other hand, the pump performance characteristics have many factors that cause instability on the low flow rate side. In this regard, in this embodiment, the flow load of the high-pressure water supply pump 54 is added to the amount of water supplied to the medium-pressure economizer 77.
The operation characteristics of No. 4 can be stabilized, whereby the driving power can be reduced, the life can be prevented from being shortened by erosion, and the economy and reliability in operating the high-pressure feed pump can be improved. The present invention can be applied not only to the single-shaft combined cycle plant shown in the drawings but also to a multi-shaft combined cycle plant.

As described above, according to this embodiment,
The low-pressure economizer 35 and the high-pressure economizer 38 are connected to the water supply pipes 51 and 5.
A high-pressure water supply pump 54 is provided in the water supply pipe 90, and the high-pressure water supply pump 54 supplies water to the high-pressure steam drum 39 through the high-pressure economizer 38. A water supply pipe 91 for extracting water and supplying the extracted water to the medium-pressure economizer 77 is provided, and the design flow rate and design pressure of the high-pressure water pump 54 can be expanded to achieve the specifications of a standard pump. This has the effect that the range of selection can be expanded.

Further, since the intermediate-pressure water supply pump 80 (see FIG. 4) can be eliminated, there is an effect that the equipment cost can be reduced, and since special-specific equipment is not required, installation and maintenance are simplified. There is an effect that can be achieved. Further, since the high-pressure water supply pump 54 can be provided as a standard specification, there is an effect that the selection range can be expanded and the reliability of the pump can be improved.

When the low-temperature water-supplying unit 35 generates low-temperature water and heats up the low-water-saving unit, the outer surface of the low-pressure water-saving unit tube may be corroded. High-temperature water from the high-pressure water supply pump 54 is extracted. Thus, corrosion can be prevented by reducing the temperature difference on the outer surface of the tube. That is, by using the high-pressure water supply pump 54 as a water supply source for preventing corrosion, the installation of the dedicated pump is eliminated, and the flow rate of the high-pressure water supply pump 54 is increased, and the effect that can be made the standard pump specification can be obtained. is there.

[0037]

As described above in detail, according to the present invention, the design specifications of the high-pressure water pump are standardized by eliminating the medium-pressure water pump and supplementing the load of the medium-pressure water pump with the high-pressure water pump. It is possible to provide a water supply system and a waste heat recovery boiler of a combined cycle plant that can have specifications. Further, according to the present invention, a water supply system and a waste heat recovery bottle of a combined cycle plant capable of improving the efficiency of a high-pressure water pump and stabilizing operation characteristics are provided.
Iraq can be provided.

[Brief description of the drawings]

FIG. 1 is a system diagram of a combined cycle plant according to one embodiment of the present invention.

FIG. 2 is a system diagram showing a conventional gas turbine power plant.

FIG. 3 is a system diagram showing a conventional steam turbine power plant.

FIG. 4 is a system diagram of a combined cycle plant currently considered .

[Explanation of symbols]

 33 gas turbine 34 waste heat recovery boiler 35 low pressure economizer 36 low pressure steam drum 37 low pressure evaporator 38,86 high pressure economizer 39 high pressure steam drum 42 high pressure evaporator 43 superheater 44,45 steam pipe 46 steam turbine 47 condensate Container 48 Water supply pipe 49 Low pressure water supply pump 51, 53, 57, 87, 90, 91 Water supply pipe 54 High pressure water supply pump 54a Bleed pipe 77 Medium pressure economizer 78 Medium pressure steam drum 79 Medium pressure evaporator 83 Medium pressure superheater 84 Reheater 85 Steam piping 92 Water supply bypass

Claims (5)

(57) [Claims] 1. The condensate taken out of the condenser is supplied to a low-pressure steam drum via a low-pressure economizer, passed through the low-pressure economizer, and then passed through a medium-pressure economizer to produce a medium-pressure steam. In a water supply system of a combined cycle plant having high, medium and low pressure steam drums provided with a piping system for supplying water to a drum and a piping system for supplying water to a high pressure steam drum through a high pressure economizer, the low pressure economizer includes: A water supply pipe directly connected to the high-pressure water-saving device is provided, and a high-pressure water supply pump is provided in the water-supply line, and the high-pressure water supply pump supplies water to the high-pressure steam drum through the high-pressure water-saving device. A water supply system for a combined cycle plant, wherein a water supply pipe for extracting water and supplying the extracted water to a medium-pressure economizer is provided. 2. The method according to claim 1, wherein water extracted from an intermediate stage of the high-pressure water pump is supplied to a medium-pressure steam drum, and a water-extraction pipe of the high-pressure water pump is further branched to return to a low-pressure economizer. The water supply system for a combined cycle plant according to claim 1. 3. The condenser is taken out of the condenser by a condenser pump.
Distribution of condensate to low-pressure steam drum via economizer
Pipe system and distribution to supply to medium pressure steam drum via economizer
Pipe system and piping system for supplying water to the high-pressure steam drum via a economizer
Combine with high, medium and low pressure steam drums with
In a water supply system of a waste cycle plant, a water saving system provided in a piping system for supplying water to the high-pressure steam drum is provided.
High-pressure economizer is supplied as water to the medium-pressure steam drum
A medium-pressure economizer is provided as a economizer provided in the piping system, and a high-pressure supply is provided to the piping system connecting the condenser and the high-pressure steam drum.
A water pump is provided, and the high pressure
Water to the high-pressure steam drum through the
Water is extracted from the middle stage of the water pump, and the extracted water is
Combined cycle pump characterized by supplying water to the vessel
Runt water supply system . 4. A condenser taken out of the condenser by a condenser pump.
Condensate is supplied to the high pressure evaporator via the water supply piping and the economizer.
High pressure steam drum connected to the medium pressure evaporator connected
Medium-pressure steam drum, low-pressure steam dryer connected to low-pressure evaporator
Exhaust heat recovery boiler configured to supply water to each
A high-pressure water supply pump provided in the water supply pipe;
A water supply system for supplying water to the high-pressure steam drum by a pump;
Water is extracted from the middle stage of the high-pressure water pump, and the extracted water is
A water supply system for supplying water to the high pressure steam drum;
Steam from the high pressure steam drum and medium pressure steam drum
Equipped with high-pressure and medium-pressure superheaters for superheating
Waste heat recovery boiler . 5. A high-pressure and medium-pressure economizer is provided.
The water supply system for supplying water to the high-pressure steam drum has the high-pressure water supply port.
Water from the pump via the high pressure economizer,
The water supply system for supplying water to the medium-pressure steam drum is
Condensate is extracted from the middle stage of the pump through the medium pressure economizer.
7. An exhaust heat recovery unit according to claim 6, wherein
Ira .